The truck was reportedly carrying outdated medical equipment used
to perform radiotherapy when it was hijacked at a gas station in
Tepojaco, Hidalgo – near Mexico City – on Monday, the National
Commission of Nuclear Safety and Safeguards (CNSNS) said.

The white Volkswagen Worker semi-trailer had reportedly stopped
en route from a hospital in Tijuana to a radioactive waste
storage center.

On Wednesday, the truck was found not far from where it was
stolen outside of Mexico City -- a Mexican nuclear official
quoted by the AP said the stolen container carrying the
radioactive material was found empty.

CNSNS authorities said the cobalt-60 teletherapy source posed no
health risk as long as the part of the equipment housing the
radioactive source is not cracked.

"At the time the truck was stolen, the source was properly
shielded. However, the source could be extremely dangerous to a
person if removed from the shielding, or if it was damaged,"
the International Atomic Energy Agency (IAEA) said.

"The Mexican authorities are currently conducting a search for
the source and have issued a press release to alert the
public," the UN nuclear watchdog said. Local authorities have
urged calm, telling the public the threat posed by the stolen
equipment is minimal.

According to the IAEA, sealed radioactive sources are widely used
in medicine for the treatment of malignant diseases and for blood
irradiation. Cobalt-60 sources are often deployed in teletherapy,
a form of external beam radiotherapy used to treat cancer, and
brachytherapy – also known as internal radiotherapy.

Experts have previously warned that such radioactive sources have
long been held by hospitals without sufficient security. Although
such materials cannot be employed in a conventional nuclear
weapon, they can be put in a so-called “dirty bomb,” a
speculative radiological weapon that combines radioactive
material with conventional explosives.